Newsflash: Has anyone ever started as sole prop, then formed a llc later? How was the process?

Im currently a sole prop, because my personal credit cards/loan rates are extremely favorable. Now that I have two rentals [paid off] and looking to buy my personal residence, id like to consider a llc [just for best practices sakes].What process did you follow and how did you structure the llc (s)?Do you form another llc for “management”?Id like to cash out on both of these houses and buy two more. I was quoted a generous rate but it was a personal loan. If i move them to the llc is this still possible or would I shoot myself in the foot and have to deal with commercial loans?Would the LLC name be different than the current DBA name?thanks!